My son-in-law asked me to look at his JV80 Roland keyboard as it didn't
seem to work properly.
Found the operators and service manuals on line and discovered the
keyboard wouldn't go into self test. Took back off and started checking
the switches - found that ALL 54 push-button PC mount switches had
failed or were marginal at best.
Replaced all the switches (gotta love single sided phenolic PCBs...) and
now it works a treat.
So if you have any musician friends with wonky keyboards the solution is often simple...
John :-#)#
--
On Wednesday, November 24, 2021 at 5:26:29 PM UTC-5, John Robertson wrote:
My son-in-law asked me to look at his JV80 Roland keyboard as it didn't
seem to work properly.
Found the operators and service manuals on line and discovered the
keyboard wouldn't go into self test. Took back off and started checking
the switches - found that ALL 54 push-button PC mount switches had
failed or were marginal at best.
Replaced all the switches (gotta love single sided phenolic PCBs...) and
now it works a treat.
So if you have any musician friends with wonky keyboards the solution is
often simple...
John :-#)#
--
Just curious. That's an older 61 key synth, per google. (I'd not heard of a 54 key keyboard so I looked it up.) So why are there only 54 switches for 61 keys?
On Wednesday, November 24, 2021 at 5:26:29 PM UTC-5, John Robertson
wrote:
My son-in-law asked me to look at his JV80 Roland keyboard as it
didn't seem to work properly.
Found the operators and service manuals on line and discovered the
keyboard wouldn't go into self test. Took back off and started
checking the switches - found that ALL 54 push-button PC mount
switches had failed or were marginal at best.
Replaced all the switches (gotta love single sided phenolic PCBs...)
and now it works a treat.
Just curious. That's an older 61 key synth, per google. (I'd not heard
of a 54 key keyboard so I looked it up.) So why are there only 54
switches for 61 keys?
In article <196f12fc-8cb7-4f4f-bd9d-c33de47d63b7n@googlegroups.com>, timothy42bach@gmail.com says...
On Wednesday, November 24, 2021 at 5:26:29 PM UTC-5, John Robertson
wrote:
My son-in-law asked me to look at his JV80 Roland keyboard as it
didn't seem to work properly.
Found the operators and service manuals on line and discovered the
keyboard wouldn't go into self test. Took back off and started
checking the switches - found that ALL 54 push-button PC mount
switches had failed or were marginal at best.
Replaced all the switches (gotta love single sided phenolic PCBs...)
and now it works a treat.
Just curious. That's an older 61 key synth, per google. (I'd not heard
of a 54 key keyboard so I looked it up.) So why are there only 54
switches for 61 keys?
I'm guessing that's the tactile switches used for selecting various functions, rather than the keys themselves (although I count 56 push-
buttons rather than 54). This seems to be a known failure mode on some
older Roland synths; there are certainly maintenance kits out there with
the appropriate numbers of switches.
I should really get around to fixing my two broken D-50s, which do have temperamental buttons, but also have more immediate problems (one has
random bursts of noise, the other has been previously "repaired" by
someone whose desoldering technique could hardly have been more
destructive if they'd used a blowtorch and chisel).
R
On Wednesday, November 24, 2021 at 5:26:29 PM UTC-5, John Robertson wrote:
My son-in-law asked me to look at his JV80 Roland keyboard as it didn't
seem to work properly.
Found the operators and service manuals on line and discovered the
keyboard wouldn't go into self test. Took back off and started checking
the switches - found that ALL 54 push-button PC mount switches had
failed or were marginal at best.
Replaced all the switches (gotta love single sided phenolic PCBs...) and
now it works a treat.
So if you have any musician friends with wonky keyboards the solution is
often simple...
John :-#)#
--
Just curious. That's an older 61 key synth, per google. (I'd not heard of a 54 key keyboard so I looked it up.) So why are there only 54 switches for 61 keys?
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